linux-kernel - [PATCH v2 0/4] linux/const.h: cleanups of macros such as UL(),

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Date:   Thu,  5 Jan 2017 11:20:05 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     "H . Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Russell King <linux@...linux.org.uk>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Olof Johansson <olof@...om.net>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Pratyush Anand <panand@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        James Morse <james.morse@....com>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        linux-m68k@...ts.linux-m68k.org, Guan Xuetao <gxt@...c.pku.edu.cn>,
        Shaohua Li <shli@...com>,
        Alexander Popov <alex.popov@...ux.com>,
        Guoqing Jiang <gqjiang@...e.com>, linux-kernel@...r.kernel.org,
        Santosh Shilimkar <ssantosh@...nel.org>,
        zijun_hu <zijun_hu@....com>, Laura Abbott <labbott@...hat.com>,
        Neeraj Upadhyay <neeraju@...eaurora.org>
Subject: [PATCH v2 0/4] linux/const.h: cleanups of macros such as UL(), _BITUL(), BIT() etc.


ARM, ARM64, UniCore32 define UL() as a shorthand of _AC(..., UL).
In the future, more architectures may introduce it, so move
the definition to include/linux/const.h.

The _AC() is used for either (likely) UL or (unlikely) ULL.
Having UL(L) in a common place can avoid direct use of _AC().

The _AC() is defined under the uapi directory, so it compels
underscore-prefixed macros even for unexported headers.

I see similar situation for _BITUL().  This is available in
both C and assembly.  However, it is defined in an uapi header,
so direct use of the underscore macro is needed even for unexported
headers.  The 3/3 makes BIT() available in assembly too, which will
be more suitable for use in unexported headers.


Changes in v2:
  - Split out as a prerequisite patch

Masahiro Yamada (4):
  m68k: rename UL() to TO_UL()
  linux/const.h: move UL() macro to include/linux/const.h
  linux/const.h: refactor _BITUL and _BITULL a bit
  linux/const.h: move BIT(_ULL) to linux/const.h for use in assembly

 arch/arm/include/asm/memory.h       |  6 ------
 arch/arm64/include/asm/memory.h     |  6 ------
 arch/m68k/mm/init.c                 |  6 +++---
 arch/unicore32/include/asm/memory.h |  6 ------
 include/linux/bitops.h              |  3 +--
 include/linux/const.h               | 12 ++++++++++++
 include/uapi/linux/const.h          | 13 ++++++++-----
 7 files changed, 24 insertions(+), 28 deletions(-)
 create mode 100644 include/linux/const.h

-- 
2.7.4